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<div id="breadcrumbs" style="display:none"><a href="masukan.html">Input</a> &gt; <a href="data_spasial_dan_cadangan_karb.html">Spatial &amp; Carbon Stock Data</a></div>

<div id="printheader"><h1 class="p_Heading1"><span class="f_Heading1">Carbon Stock</span></h1>
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   <a href="masukan.html">Input</a> &gt; <a href="data_spasial_dan_cadangan_karb.html">Spatial &amp; Carbon Stock Data</a>&nbsp;&gt;</p>
   <h1 class="p_Heading1"><span class="f_Heading1">Carbon Stock</span></h1>

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<p style="text-align: justify; line-height: 1.15; margin: 0px 0px 8px 0px;"><span style="font-size: 16px; font-family: calibri;">The stock-difference</span><span style="font-size: 16px; font-family: calibri; font-style: italic;"> </span><span style="font-size: 16px; font-family: calibri;">method builds on carbon stock inventories from land use changes to estimate sequestration or emissions. Carbon stocks in each carbon pool are estimated by measuring the standing stock of biomass at the beginning and at the end of the accounting period.</span></p>
<p style="text-align: justify; line-height: 1.15; margin: 0px 0px 13px 0px;"><span style="font-size: 16px; font-family: calibri;">Within each land-use category, C stock changes and emission/removal estimations can involve the five carbon pools that are defined in IPCC Guidelines. For some land-use categories and estimation methods, C stock changes maybe based on the three aggregate carbon pools (i.e., biomass, dead organic matter and soils). National circumstances may require modifications of the pool definitions introduced in IPCC Guidelines (IPCC 2006).</span></p>
<p style="text-align: justify; line-height: 1.15;"><span style="font-size: 16px; font-family: calibri;">Four main steps of C-stock changes estimation (figure) are:</span></p>
<p style="text-align: justify; padding: 0px 0px 0px 24px; margin: 0px 0px 0px 24px;"><span style="font-size:16px; font-family: 'calibri';color:#000000;display:inline-block;width:24px;margin-left:-24px">a.</span><span style="font-size: 16px; font-family: calibri;">Estimation of time-averaged C-stock of each land use systems to determine the emission factors, i.e., differences between time-averaged C-stock of original land use systems with subsequences land use systems.</span></p><p style="text-align: justify; padding: 0px 0px 0px 24px; margin: 0px 0px 0px 24px;"><span style="font-size:16px; font-family: 'calibri';color:#000000;display:inline-block;width:24px;margin-left:-24px">b.</span><span style="font-size: 16px; font-family: calibri;">Quantification of activity data, i.e., areas of each transitions of land use / cover types.</span></p><p style="text-align: justify; padding: 0px 0px 0px 24px; margin: 0px 0px 0px 24px;"><span style="font-size:16px; font-family: 'calibri';color:#000000;display:inline-block;width:24px;margin-left:-24px">c.</span><span style="font-size: 16px; font-family: calibri;">Calculation of emission estimation based on the activity data from step B and emission factors from step A.</span></p><p style="text-align: justify; padding: 0px 0px 0px 24px; margin: 0px 0px 0px 24px;"><span style="font-size:16px; font-family: 'calibri';color:#000000;display:inline-block;width:24px;margin-left:-24px">d.</span><span style="font-size: 16px; font-family: calibri;">Uncertainty analysis of the estimates</span></p><p style="text-align: center; line-height: 1.15;"><img src="hmfile_hash_2dcfaf8b.png" width="503" height="347" alt="4main step" style="border:none" /></p>
<p style="text-align: center; line-height: 1.15; margin: 0px 0px 0px 24px;"><span style="font-family: calibri; font-style: italic;">Source: Ekadinata et al. 2010</span><span style="font-size: 16px; font-family: calibri;"> </span></p>
<p style="text-align: center; margin: 0px 0px 13px 0px;"><span style="font-size: 16px; font-family: calibri;">Four main steps of the C‐stock‐difference estimation from land use</span></p>
<p style="line-height: 1.15;"><span style="font-size: 16px; font-family: calibri; font-weight: bold;">Time - averaged carbon stock (c-stock)</span></p>
<p style="text-align: justify; line-height: 1.15; margin: 0px 0px 8px 0px;"><span style="font-size: 16px; font-family: calibri;">The concept of time-averaged C-stock along with land use-systems are particularly developed to suit the common patterns of land use trajectories in the tropical landscapes with a definite and relatively short rotation. As an example, the traditional shifting cultivation cut across several different sequences of land cover types (e.g., secondary forest-cleared land-annual crop-shrub-agroforest) and different land use and activities (e.g., non-timber forest product gathering, slashing and burning-planting and harvesting of paddy-rubber tapping, rattan harvesting) within a particular rotation period (e.g., 40 years, 60 years). Land use systems should be able to capture the temporal dynamics of C-stock such that the typical or average C-stock across a system can be calculated, which is known as time averaged C-stock. </span></p>
<p style="text-align: justify; line-height: 1.15; margin: 0px 0px 8px 0px;"><span style="font-size: 16px; font-family: calibri;">For the purpose of a REDD+ opportunity cost analysis, a value of time averaged carbon stock is needed for each land use. This single value is used for carbon accounting purposes and compared with a single-value economic indicator of Net Present Value (NPV) is necessary for each land use. A time-averaged carbon stock value integrates the gains and losses over a life-cycle of a land use(ton/ha or mg/ha).</span></p>
<p style="text-align: justify; line-height: 1.15; margin: 0px 0px 8px 0px;"><span style="font-size: 16px; font-family: calibri;">Time-averaged carbon stock data is normally obtained from measurements. The basic assumption for area-based carbon-stock accounting is the carbon stock changes occurred within and between land-use systems, each characterised as a fraction (a</span><span style="font-size: 16px; font-family: calibri; vertical-align: sub;">i</span><span style="font-size: 16px; font-family: calibri;">) of total area (A) (the stratum weighting) and with time-dependent carbon stock density C</span><span style="font-size: 16px; font-family: calibri; vertical-align: sub;">it</span><span style="font-size: 16px; font-family: calibri;"> (the stratum mean). See the manual of RACSA (Hairiah et al. 2010) for further information about the method for calculating time-averaged carbon stock. </span></p>
<p style="text-align: justify; line-height: 1.15;"><span style="font-size: 16px; font-family: calibri; font-weight: bold;">How to input data carbon stock:</span></p>
<p style="text-align: justify; line-height: 1.15; margin: 0px 0px 8px 0px;"><span style="font-size: 16px; font-family: calibri;">Click </span><span style="font-size: 16px; font-family: calibri; font-weight: bold;">input</span><span style="font-size: 16px; font-family: calibri;"> button from main menu </span><span style="font-size: 16px; font-family: Wingdings;">&rarr;</span><span style="font-size: 16px; font-family: calibri;"> </span><span style="font-size: 16px; font-family: calibri; font-weight: bold;">spatial &amp; carbon stock data</span><span style="font-size: 16px; font-family: calibri;"> </span><span style="font-size: 16px; font-family: Wingdings;">&rarr;</span><span style="font-size: 16px; font-family: calibri;"> </span><span style="font-size: 16px; font-family: calibri; font-weight: bold;">carbon stock</span><span style="font-size: 16px; font-family: calibri;"> or expands the tree menu on the structured menu frame (on the left side by default) click </span><span style="font-size: 16px; font-family: calibri; font-weight: bold;">+input</span><span style="font-size: 16px; font-family: calibri;"> </span><span style="font-size: 16px; font-family: Wingdings;">&rarr;</span><span style="font-size: 16px; font-family: calibri;"> </span><span style="font-size: 16px; font-family: calibri; font-weight: bold;">+spatial &amp; carbon stock data</span><span style="font-size: 16px; font-family: calibri;"> </span><span style="font-size: 16px; font-family: Wingdings;">&rarr;</span><span style="font-size: 16px; font-family: calibri;"> </span><span style="font-size: 16px; font-family: calibri; font-weight: bold;">carbon stock.</span></p>
<p style="text-align: center; line-height: 1.15; margin: 0px 0px 8px 0px;"><img src="hmfile_hash_d8604206.png" width="606" height="349" alt="Carbon Stock" style="border:none" /></p>
<p style="text-align: justify; line-height: 1.15;"><span style="font-size: 16px; font-family: calibri;">Fill in the associated carbon stock data to the table. The unit is on (Ton/ha). You can do copy and paste method for modifying the data on the table (ex. Copy data from excel).</span></p>
<p style="text-align: center; line-height: 1.15;"><img src="hmfile_hash_19baeceb.jpg" width="603" height="494" alt="input CS" style="border:none" /></p>
<p style="text-align: center; line-height: 1.15;"><span style="font-size: 16px; font-family: calibri;">Input carbon stock data</span></p>

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